1. Kill the hung process properly bash 2. Check Elasticsearch logs for confirmation bash Look for: 3. Increase systemd startup timeout (immediate workaround) Create an override so systemd waits longer than 15 minutes: bash 4. Reduce JVM heap size (strongly recommended) With 2.5 GiB total RAM, a 2 GiB heap is unsustainable. Reduce it to
ELK Slow to Start- Need to fix the timeout limit Read Post »
diagnostic steps, in order: 1. Check the service state bash Look for: 2. Check recent logs from systemd bash Look for Java errors, OOM Killer, failed to start, permission denied, or config file syntax errors. 3. Check Elasticsearch’s own logs bash If the service started partially and crashed, the Java stack trace will usually be
Troubleshooting ELKStack Read Post »
#!/bin/bash ============================================================================= ELK Stack Health Check Script Description: Checks Elasticsearch, Logstash, Kibana, Filebeat, and system resources relevant to the ELK stack. Intended for: master3 (or wherever ELK services are running) ============================================================================= set -euo pipefail Colors RED=’\033[0;31m’GREEN=’\033[0;32m’YELLOW=’\033[1;33m’BLUE=’\033[0;34m’BOLD=’\033[1m’NC=’\033[0m’ # No Color Configurable endpoints ES_HOST=”${ES_HOST:-http://localhost:9200}“KB_HOST=”${KB_HOST:-http://localhost:5601}“LS_HOST=”${LS_HOST:-http://localhost:9600}“ PASS=0WARN=0FAIL=0 ============================================================================= Helper Functions ============================================================================= print_header() {echo -e “${BOLD}${BLUE}>>> $1${NC}”} pass() {echo -e
ELK Stack Health Check Script Read Post »
the most common ways to inspect services and roles on Ubuntu. 1. Services (systemd) Modern Ubuntu uses systemd to manage services. List all services and their status bash Show only active (running) services bash Check a specific service bash Example: systemctl status ssh List services that start on boot bash Legacy service command (still works)
How to check all the roles and services in ubunutu Read Post »
PowerShell investigation script: Investigate-ADDNS.ps1 What the script does This script performs a comprehensive health check on a Windows Server that hosts both Active Directory Domain Services (AD DS) and DNS Server. It is designed to run directly on the target server as an Administrator. Here is a summary of the checks it performs: How to
PowerShell diagnostic script for investigating DNS issues on an AD-integrated DNS server Read Post »
1. Suricata – The IDS/IPS Engine 2. Zeek (formerly Bro) – The Network Analyzer Suricata vs. Zeek: Suricata tells you “I found a known bad thing.” Zeek tells you “here’s everything that happened on the network.” 3. Arkime (formerly Moloch) – The Packet Capture & Search How They Work Together Tool Primary Function Key Question
Security Monitor (Suricata + Zeek + Arkime) Read Post »
full comparison of Zeek vs Suricata vs Wazuh. The most important thing to understand is that Wazuh plays in a completely different category than Zeek and Suricata, though they complement each other very well. Quick Summary Table Zeek Suricata Wazuh Category Network traffic analyzer / NSM Network IDS / IPS / NSM SIEM / XDR
Zeek vs Suricata vs Wazuh Read Post »
a clear breakdown of Zeek vs Suricata. The short answer is: they are complementary tools that solve different problems, and many security teams run both together. At a Glance Zeek Suricata Primary role Network traffic analyzer / NSM IDS / IPS / NSM engine Detection style Protocol analysis, metadata extraction, scripting Signature/rule-based alerting Can it
Zeek is a single tool, while Security Onion is a full platform that includes Zeek. So they are not really direct competitors; it depends on the use case. What is Zeek? Zeek (formerly Bro) is an open-source, passive network traffic analyzer. Zeek Documentation In short, Zeek is like a very detailed surveillance camera for your
Zeek Vs Security Onion Read Post »
Quantum computing, while still in its nascent stages, has demonstrated capabilities and holds immense promise for revolutionizing various industries by tackling problems currently beyond the reach of classical computation. Pharmaceuticals and Drug Discovery Quantum computers are poised to significantly accelerate the research and development of new drugs and medical treatments by simulating molecular behavior and
5. Current and Emerging Applications Across Industries Read Post »